20 markers are needed to cover the 10 kilometers.
Answer: The Answer is <u>A: 7.685</u> but then round it up to <u>8</u> on edge
To answer (a), we will need to find the Z value for 710 hours and 990 hours.


B) 68% of data lies between one standard deviation of the mean.
850 +70 = 920
850 - 70 = 780